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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.233 ·

Bash and PowerShell tools can run under a memory limit on Linux

On Linux you can cap memory for shell commands so a runaway process cannot eat your machine.

Use it now Notable New Features
JSON All of v2.1.233
Use it nowTier: how much it should matter to you
4Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
Bash ToolArea: what it touches
New FeaturesKind: in v2.1.233,
What probably matters to youSection of the release
What

On Linux and WSL, shells spawned by the Bash and PowerShell tools can now be placed in a claude-code-bash memory cgroup so a runaway command hits a cap instead of your machine. Set CLAUDE_CODE_TOOL_MEMORY_LIMIT to a size such as 2g to pick the cap, or to none to switch it off. With no explicit size it only engages when the remote flag tengu_tool_memory_cgroup is on, which is off by default in this build.

Details
  • Writes memory.max on cgroup v2 and memory.limit_in_bytes on v1.
  • With no override the limit is derived from total system RAM.
  • Other platforms return early and spawn normally.
  • Reports the outcome as tengu_tool_cgroup with status enabled or disabled, and logs a tool cgroup: disabled ( line with the reason.
Usage
CLAUDE_CODE_TOOL_MEMORY_LIMIT=2g claude
Evidence

tengu_tool_cgroup, tool cgroup: disabled (

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Names in the bundleCLAUDE_CODE_TOOL_MEMORY_LIMIT
Feature flag
tengu_tool_memory_cgroup Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.233: off

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.233. It isn't a statement about your account. What a flag value here can and cannot tell you

What has happened since
Flag reading moved The flag server now returns off for tengu_tool_memory_cgroup, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns nothing at all, having stopped carrying it for tengu_tool_memory_cgroup, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.

See this across every release →

How sure we are
Two sources agreeTwo things we can check say the same as this entry.
Anthropic's release notes agreeAdded opt-in memory cgroup support for Bash tool commands on Linux (CLAUDE_CODE_TOOL_MEMORY_LIMIT) so a runaway build can't stall the…
The name it cites is new in this buildNew in this build: CLAUDE_CODE_TOOL_MEMORY_LIMIT

See this entry in the whole of v2.1.233 →

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